Well-boring tool.



A. ROTINOFP.

WELL BORING TOL.

APPLICATION HLED DEG. 2o, 1911.

Patented Dec. 31, 1912 rwswn Eggi l @if l sri-iras manna onirica.,

ALEXANDER RTINOFF, OF ST. PETERSBURG, RUSSIA.,

WELL-BORING TOOL.

Spcication of Letters Patent. l

To aillwhom nitmay concern: l

Be it known that I, ALEXANDER Ro'riNorr, a subject of the Czar oflRussia,.residing at St. Petersburg, Russia, have invented cer,-v ktainnew and useful Improvements 'in Well- BOIng Tools, of whichthe followingisa Specification.- Y

This invention relates to new and useful. "improvementsinwell-boringtools and .re-

fers .particularly to contractible heads therefor.

The object of this inventionis to provide a well-boring tool which canbe vwithdrawn,

with ease and operates with certainty.

To `more particularly disclose one convenient way of constructing thecontractible head according to this invention,4 reference is made to theaccompanying drawings,

inwhich:-

Figure l is a part sectional elevation through the head showing the samein its contracted state; Fig. 2 is a similar viewA but'shows the headwith the parts in their .expanded-position; Fig. isA a. section Aon theline P-Q viewed inl the direction of the arrow Z the right-hand part ofthe view showing the position of the various parts when the head iscontracted as in Fig; l, and the left-hand part of the view showingthese parts in the expanded osition. In a head of this 'description usedin a sinking tool, a conical or similar form is employed and the base ofthis conical head,

.made ofrigid sections, is contractible. The

head is so constructed thatwhen its tip is unsupported from below Qrwhen apull is exerted on it, the diameter of the said head is reducedautomatically to an extent sufficient to enable it to travel up and downwithout hindrance through the tube or borehole. The stoppage of the tipof the head by the ground while the ydescent of other portions of thetool continues will result in the 4 automatic expansion of theconractible portion of the head to its maximum dimension. The rigidsections forming the contractible part or base of the conical head aresojdisposedthat their faces with or without-those of the head, present asingle smooth externa-l contour when the contractible part is expanded.For such a contractible head, mechanism is provided which isconstructedto contract the head by moving the sections inward in succession andcharacterized by that constructionvin such a manner that ituactspositively, is ini elastic and vunyielding. The contraction a PatentedDec. 31, 1912. l Application ined December 2o, 1911. 'serial No.666,908.

and expansion vof the head is brought abouti by an operative connectionwith` the monkey or with thefsuspension rod of the sinking tool-Referring to the drawings and 4more particularly to Fig. Q,UA is a -rod'which, inl

conjunction with the sleeve B, is operatively connected in anyconvenient way to the monkey indicated at C; The rod .A slides within Ythe tube or sleeve Band takes a bearing Within' the Platter on theenlargements Al A2'A? formed upon itself. Atits lower end B1 the--sleeve B is screwed Vinto `the conical head E which constitutes theworking `portion ofthe tool and'is provided at E1 with vfollow Aanymovements of the rodvA. The

sleeve Fjhas' a flange-,F1 at its lower end and at fits upper `end isprovided with a ring F2 which screws over the sleeve as shown providedwith shaped recesses at F3 lwhich coperate with similar recesses F 4 yformed within the upper partof the sleeve.

The ila-ngel?l is also drilled at F 5. The recesses at'F2 and ,F2 in thecap- F2 and sleeve F grip [the T-shaped v heads Gl of shaped strips G2.G3, while the 'holes at F5 receive de wel pins Gr2 alsol formed on thestrips `G2 G3 which are shouldered at G5 to abut against the upper sideof the flange F1 so as to position them and `hold them vsecurely inplace. The sleeve F has short project-ing shaped webs G6 G7 whichcoperatel with the strips G2 G3 respectively'to form the cam' slots GXGy indicated in the draw- These slots receive rollers H H1 ings. mountedrespectively on spindles H2 H3, which spindles are secured in the pairsof arms H4 H5 which project vinwardly from the pieces K K1- of whichthey form a part. The pieces K are, as will be seen from a reference'toFig. 3, of approximately seg- -a hardened orv other specially-treatedpoint. Y

mental shape in plan while the pieces K1 are wedge-shaped-and narrow.The segments are beveled at K2 and rounded at K3 and `conform, asv alsodo the wedge-shaped pieces, to the general shape of the conical head Eas regards their vertical section..

The segmental pieces. in their expanded position, do' not quite ll upthe periphery; the pieces "lill therefore of such width that 'when`theymove outward for the expansion of the head, the external contour ofthe latter is smooth and unbroken.

rl"he conical. part E, the expanding partd made up of the pieces l andli? and the upper part of the head D, are recessed suitably at E3 l@ andD2 to permit of movement of the various parts contained within. them.rlhe part D of the head is also` recessedas at D3 to receive the springL which abuts' upon the end .Di of the clearance vD3 and exerts pressureupon the end FG of the sleeve l?.

-rlhe part lil of the lower or conical part lil of the head lpassesupward through the cony tractible part thereof andat E is threaded toreceive the correspondingly threaded upper part D as indicated by lig.2. The part E5 is slotted as at E7 to permit of the pasvsage of theoperating mechanism of the con.-

tractible portion'of the head. The part D is clear of the latter at D5andv not only does not interfere with the motion of the operatvingmechanism but by its construction transmits the. blows of themonkeydirect to `i the"workingy point of the lhead and not through)thevarious sections or through the `operating mechanism. 'Sinking tubeis -to the segmental pieces K and the. wedgeshown at Q.'

The slots Gl Gyrespecti'vely represent sets of slots shown in Fig. 2which correspond shaped pieces K1. Each of the set of slots representedby GX is of different shape from Veach of the set of slots representedby Gry, .'jthatis to say, Gy is more sharply -inclined to the-verfticalcenter axis ofthe head and the inclined portion of it commences at apoint* nearer to its lower endend finishes at a point nearer the upperend than is the case with a slotbelonging to the G group.

ln operation, the movement of the mon-V key C in the. position of Fig l,causes the `rod A. tomove downward should any of the parts stickandduring the descent of .this

monkeyandwith it the rod A, the sleeve F is caused bythe spring L tomove down- Wa'rd'so thatfthe rollers H and H1 move relatively up theirrespective cam slots Gx and G1' yand so force the arms H4 H5 to whichthey are respectively pinned, tomove radi from that of the v slot Gx thepieces K will move first to/theirexpanded position as. shownby theleft-hand'half of Fig. 3 and a little later on' the pieces K1 .willbeginto ally ontward'from the center. of the head fand thus to carry outwardthev respective ieces which they bear. Because of the diferentinclination and shape of the slot GY move outward so as to fill up thespaces which are left between the expanded -segmental pieces Whenfthemonkey 'Gis withdrawn by any means ,which may be con.-4

thehead move insuccessionmthe head can only be contracted when the partsK1 are moved clear ofthe parts K. The maximum external diameter of y the'head may. be greater than that of the sinking tube' when such is usedand its .minimum 4diameter may be less than thefinternal diameter ofthesinking tube so thatwithdrawal of thel head is rendered very easy.' ltwill be seen that external pressure of the soil in the borehole or ofwater which may be present there cannot readily causa the head tocontract as the parts, rigid and `unyielding, are to a large extentinterlock `ing in their expanded state. Nor can the working of the toolbe easily interfered with as Vthe head presents a single smoothexternal' 'contour in its vexpanded position. The

operation of contracting .the head may also be performed by an operativeconnection with the suspension rod on which the whole t'ool may becarried. t"

to secure by Letters Patent is 1. In a well-boring tool, heicoinbinationwith .a suspender therefor, of a head with a Atapei ended lower portioncomprising'mov'- able sections presenting a single smooth anj nula-r,`external contour, means operatively vconnecting thesaid sections and thesus-Ar penden ,to automatically move said sections to reduce and enlargethe diameter of the said lower portion by a non-rotary' recti linearmovement of the suspender, substantially as described..

2,111 a well-boring tool, a head with a 'taper-ended lower portion,`anexpansible anf nular series of' laterally movable 'sections at theheel of the tapered part, mechanism for expanding y'and c ntracting` thesections, a

vWhat l claim as my invention and desire monkey, and an elementcoxmectin'gv the monkey .andthe said ymechanism whereby -a non-rotaryrectilinear 'movement of the "monkey"A cangexpand and contract thesections,' substantially as described.

3. In Va well-boring t l, a'. head-with a taper-endedlower portion, anlexpansible annular series of' laterally movable sections at the heelofthe tapered part, mechanism for` 'expanding andcontracting the sections,a monkey`, ad fa loaded rod movable 'in the direction fof-wits length ina plain ide in vthe.head andgconn'ecting the mon ey and thesaidmechanism,.whereby a non-rotary rectilinear vmovement ofthe monkey canex Cil la. taper-ended lower` portion, an inflexible pand and contractthe sections, substan* tially as described.

4:. In a well-boring tool, a head with a taper-ended lower portion, aniniiexible eX- tension 'upward from the tapered portion to receive andto transmit direct to the said lower portion the blows of a monkey, anexpansible series of laterally movable rigid sections which is so shapedas to present a. single smooth annular external contour located at theheel" of theY tapered part and below the said extension struck by themonkey so that the driving shock from the monkey shall be transmitted tothat tapered part otherwise than through saidseries, sub.. stantially asdescribed. v

5. A well-boring tool having a head with extension upward fromand-immovable in relation to that tapered portion and receiving theblows of the monkey, guides consti-V tuted by the top of the taperedpart together with an opposed end-face of the aforesaid iniiexibleextension, and an expansible series of laterally'movable rigid sectionsin those guides and so shaped as to present a` smoothly curvednon-stepped vannular external contour when expanded and also whencontracted, substantially'as described.

6. In a well-boring tool, an expansible series of laterally-movablerigid sections with-eXpanded their faces so disposed that the sectionswhen expanded present a smoothly curved non-stepped external contour, incombination with a mechanism which is positive and` is constructed tocontract and'expand the series by moving the sections inward insuccession, substantially as described. l

7. In a Weltbor'ing tool, an expansible se-V Aries of laterally movablerigid sections A9. 'A well-boring tool having a head provided with atapered portion, a plurality of arc-shaped members movably mounted Yinsaid head, a plurality of wedge members movably-mounted between saidarc-shaped members, and means l:tor movingy said arcshapedmembers andwedge members in' a radial direction, substantially as described.

l0. A well-boring tool having a body portion, a tapered head iXedlyconnected thereto, a plurality lof radially movable members slidabiymounted between the body and the head, said members forming a frustumoa-cone when in their expanded position,

and means y-for moving said members in a radial direction, the movingmeans forming a lock to retain lsaid members in their position,substantially as described.

In testimony-wh`ereof I havev signed my name to-this1speciication in thepresence of two subscribing witnesses.

EXANDER ROTINOFF. Witnesses T. BATES, HARRYjB. BRIDGES.

